Cash register



FIG. 1 is a front right perspective view of cash register illustrating my design;

FIG. 2 is a top right perspective view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a top left perspective view thereof.

The broken lines in the drawing show environmental features which form no part of the claimed design. 

CLAIM The ornamental design for a cash register, as shown and described. 